Well done Nemesis, the village name is the same but Mary Jones lived in the village near Cadair Idris, whereas this Llanfihangel Y Pennant is in Gwynedd near Garndolbenmaen.
I have mentioned the name of the village in the clues, albeit in the English language:-
Llanfihangel = St Michael's Church
Y Pennant = Head of the stream
The stream or river is the Afon Dwyfor
That old house is one of the first buildings you see as you go to Cwm Pennant